// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).

 // All rights reserved.

 // This component and the accompanying materials are made available

 // under the terms of "Eclipse Public License v1.0"

 // which accompanies this distribution, and is available

 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

 //

 // Initial Contributors:

 // Nokia Corporation - initial contribution.

 //

 // Contributors:

 //

 // Description:

 //

 #ifndef __LANGUTILIMPL_H__

 #define __LANGUTILIMPL_H__

 #include <f32file.h>

 #include <e32std.h>

 /**

 Specifies the maximum length of the numerical part of the suffix.

 If this is changed the documentation of the following functions 

 must also be updated:

 	LangUtil::NearestLanguageFile()

 	TNearestLanguageFileFinder::CountDigitsFromEndInValidSuffix()

 	TNearestLanguageFileFinder::SetFileName()

 */

 const TInt KMaxSuffixLength = 5;

 class RDirectoryScanner

 /**

 @internalAll

 */

     {

 public:

     virtual TInt Open(RFs& aFs, const TDesC& aMatchPattern) = 0;

     virtual TInt Next(TEntry& aOut) = 0;

     virtual void Close() = 0;

     virtual ~RDirectoryScanner() {}

     };

 NONSHARABLE_CLASS(RRealDirectoryScanner) : public RDirectoryScanner

 /**

 @internalAll

 */

     {

 public:

     virtual TInt Open(RFs& aFs, const TDesC& aMatchPattern);

     virtual TInt Next(TEntry& aOut);

     virtual void Close();

 private:

     RDir iDir;

     };

 /**

  * Add a language to the end of the language path, unless it is already

  * present. On entry, the language path must have an ELangNone entry at its

  * end. This will be true on exit also.

  * @internalAll

  */

 void AddLanguage(TLanguagePath& aPath, TLanguage aNewLanguage);

 /**

  * Create a language path from the current language, ideal language and locale. 

  * The path may have up to eight entries in it.

  * @internalAll

  */

 void MakeLanguageDowngradePath(TLanguagePath& aPath,

 	TLanguage aCurrent, TLanguage aIdeal, const TLocale& aLocale);

 /**

  * This class contains all the functions for working out the nearest language

  * file. It can be derived from for test code purposes.

  * @internalAll

  */

 NONSHARABLE_CLASS(TNearestLanguageFileFinder)

 	{

 public:

 	TNearestLanguageFileFinder(const RFs& aFs);

 	TBool SetFileName(TFileName& aFileName);

 	TLanguage Language();

 	// put back the original suffix and drive letter

 	void RepairFileName();

 	// add the preset custom resource drive, if any, to iDrives.

 	TInt AddCustomResourceDrive();

 	// add all remaining drives to iDrives. iDrives must not have more than one

 	// drive in it on entry.

 	void AddAllDrives();

 	// Tries to append the language code to iFileName. This is 00..09 or just the number.

 	// If there was not enough space, EFalse is returned.

 	TBool AppendLanguageCode(TLanguage aLanguage);

 	// Search the drives in iDrives for the file named iFileName.

 	// iFileName must have a drive specifier, which will be overwritten.

 	TBool FindDrive();

 	// Search for files across all drives in all languages in the path plus the

 	// language-neutral file.

 	// On entry, iFileName should be the original name with a drive specifier

 	// minus the suffix. On return, iFileName will be untouched if EFalse is

 	// returned, but contain the result if ETrue is returned.

 	TBool FindLanguageAndDrive();

 	// Test whether the filename passed in matches the stem given + numbers

 	// added to the end. Returns the number if it does, or KErrNotFound if not.

 	// aFileName must not end in a digit.

 	static TInt LanguageNumberFromFile(const TDesC& aFileName, const TDesC& aStem);

 	// Find lowest numbered file that matches iFileName, which must be without

 	// its suffix.

 	TInt FindFirstLanguageFile(RFs&);

 	// Try each drive for any language files that match iFileName.

 	// iFileName must have a directory specifier and be without its suffix.

 	// returns KErrNotFound, KErrNone or error code.

 	TInt FindFirstLanguageFileAndDrive();

 	virtual TInt GetCustomResourceDriveNumber() const;

 	virtual TInt FileExists(const TDesC& aFileName) const;

 	// return our member that is our directory scanning class

 	virtual RDirectoryScanner& DirectoryScanner();

 	virtual ~TNearestLanguageFileFinder() {}

 private:

 	TInt CountDigitsFromEnd(const TDesC& aFilename);

 	TInt CountDigitsFromEndInSuffix (const TDesC& aFilename);

 public:

 	const RFs& iFs;

 	TFileName* iFileName;

 	TLanguage  iLanguage;

 	TBuf<26> iDrives;

 	TLanguagePath iPath;

 	TBuf<KMaxSuffixLength> iSuffix;

 	TInt iInitialDriveLetter;

 	// length minus the removed suffix

 	TInt iOriginalBaseLength;

 	// length plus added drive letter minus removed suffix

 	TInt iBaseLength;

 	RRealDirectoryScanner iDirScanner;

 	};

 #endif // __LANGUTILIMPL_H__